A sig alert went out at 11:30 p.m. on Thursday following a multi-car collision on westbound Highway 4 near Bailey Road in Bay Point, according to the CHP.
All lanes are currently blocked.
Six vehicles were involved, CHP reported. Four of them required a tow truck to remove them from the scene.
At least one vehicle was on fire, possibly due to an explosion, and another had rolled over.
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This story is developing. Check back for updates.
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